RustFS returns empty bodies for ranged GETs whose start offset is past
~5.9 MB on single-file proxy MP4s. HEAD reports correct size, full GET
(`bytes=0-`) works, but `bytes=8179166-` comes back 206 + correct
Content-Range header with zero bytes. Confirmed via direct S3 probe
against broadcastmgmt.cloud/dragonmam (see scratch tests).
Workaround in mam-api `GET /api/v1/assets/:id/video` until the proxy
worker emits HLS (planned v1.2.1):
- HEAD the object first to learn total size (also gives ETag /
Last-Modified for conditional requests).
- No-Range / unparseable-Range / pre-EOF requests \u2192 plain pipe.
- Parsed `bytes=N-M` requests below RUSTFS_RANGE_SAFE_START
(default 5_500_000) \u2192 direct ranged GET, RustFS handles fine.
- Anything reaching into the broken zone \u2192 stream from offset 0,
drop bytes below start, stop at end. Memory stays flat; extra
bandwidth = (end+1 - requested-size) per seek.
- Genuinely out-of-range \u2192 416 with Cache-Control: no-store so the
browser doesn't poison its cache.
Also stashes (not yet wired up) the HLS pieces we'll need for the
follow-up: `segmentToHls` ffmpeg helper + `uploadDirectoryToS3`
worker s3 helper. Harmless additions; not referenced by any code path
yet.
Confirmed against the affected asset (a72aaa03-...): bytes=0-100k +
50% +100k native pass-through; 70% +100k and near-EOF previously hung
the browser, now stream correctly via the stitched path.
Refs #143.
executor.js:
- transcodeVideo() now accepts videoMinRate, videoMaxRate, videoBufSize
- When set, passes -minrate/-maxrate/-bufsize to FFmpeg for ABR/VBR mode
- libx264 operates with per-scene quality variation within the envelope
proxy.js:
- Target average: 750k (gpu_bitrate_mbps=0.75)
- Min: 375k (50% of target), Max: 998k (~133%), Buffer: 2× max
- Gives effective range of ~500k-1M depending on scene complexity
- Log now shows VBR min-max-avg
- GPU fallback also passes VBR params
- Default videoBitrate changed from 10M to 750k in executor.js
- Settings: drop AMPP tab, rename GPU/Transcoding → Proxy encoding
with explicit 'applied to every ingested file' wording, expose
CPU codec/preset options when GPU is off
- New Capture SDKs tab (Settings): upload Blackmagic / AJA / Deltacast
SDK archives (.zip / .tar.gz) staged to /sdk/<vendor>/ inside mam-api;
BMD is fully wired into the FFmpeg build pipeline, AJA + Deltacast
staging-only pending FFmpeg patches
- mam-api: new /api/v1/sdk routes (multer upload, extract, list, delete);
Dockerfile gets unzip+tar; docker-compose mounts /mnt/NVME/MAM/sdk:/sdk
- proxy worker now reads proxy-encoding settings from DB on every job,
builds args for libx264 / NVENC / VAAPI, falls back to libx264 on
hardware-encode failure
- settings GET /s3 falls back to S3_* env vars when DB is empty so the
UI reflects what's actually wired (fixes 'not configured' false alarm)
